Which of the following hypotheses is testable using scientific methods?
A) Bees can see ultraviolet light that humans can't.
B) The dinosaur Tyrannosaurus rex was a scavenger, not a predator.
C) Peacocks like to display their large tail feathers.
D) People with type O blood are natural meat eaters.
A
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In Bacteria, a chromosome can be distinguished from a plasmid, because a chromosome is a genetic element that
A) is circular. B) is linear. C) encodes for essential functional genes. D) replicates via a bidirectional fork.
Which species is the first to do poorly when the environmental conditions change? a. Indicator b. Exotic c. None of these choices
d. Keystone e. Import
In a hypertonic environment, an animal cell will do which if the following?
a. swell b. stay the same size c. shrink d. cannot be determined
What is different from one DNA nucleotide to the next?
A. The base B. The sugar molecule C. The protein D. The phosphate group